fix: linux-build limited to kernel v5.

Author: jerzyjamroz

.github/workflows/linux-build-latest.yml

@@ -47,3 +47,25 @@ jobs:
       - name: Build
         run: |
           make -C mrmShared/linux CC=${CC:=gcc} KERNELDIR="$PWD/kernel"
+
+  host:
+    name: With latest Ubuntu VM host
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Info
+        run: |
+          uname -a
+          gcc --version
+      - name: Deps
+        run: |
+          sudo apt-get update
+          sudo apt-get -y install linux-headers-`uname -r`
+      - name: Build
+        run: make -C mrmShared/linux
+      - name: Install/Load
+        run: |
+          sudo make -C mrmShared/linux modules_install
+          sudo depmod -a
+          sudo modprobe mrf
+          sudo dmesg | tail -n 100

.github/workflows/linux-build.yml

@@ -61,7 +61,7 @@ jobs:
 
   host:
     name: With VM host
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v2
       - name: Info